Role-Based Semantics for Conceptual-Level Queries.
David SilberbergRalph D. SemmelPublished in: KRDB (1998)
Keyphrases
- database query languages
- web search engines
- query processing
- query language
- database
- relational calculus
- query answers
- complex queries
- formal semantics
- sparql queries
- efficient processing
- database queries
- user queries
- range queries
- logic programming
- relational data model
- query evaluation
- semantic information
- data sources
- data model
- consistent query answering
- tree pattern queries
- null values
- aggregate functions
- relational algebra
- query logs
- expressive power